Control mechanism for printing presses



April 7, 1942, H. KOTT- CONTROL MECHANISM FOR PRINTINGPRESSES Filed June2, 1938 6 Sheets-Sheet} INVENTOR. HERMAN/V A6777 TERN April 7, 1942. H.KOTT CONTROL MECHANISM FOR PRINTING PRESSES 6 Sheets-Sheet 2 Filed June2, 1938 I jLQ m J iwbqm m wkwm b k M QMQ II E H Q w Q-\J kbvifl Q \soimr .s

April 7, 1942. H. KOTT V CONTROL MECHANISM FOR PRINTING PRESSESINVENTOR,

ATTORNEY.

6 Sheets-Sheet 5 Filed June 2, 1938 6 Sheets-Sheet 4 INVENTOR.

HERMAN/V /K0 T7.

IHHHHIHII H. KOTT CONTROL MECHANISM FOR PRINTING PRESSES Filed June 2,1938 Aprifl 7, 1942.

M WLD ATTORNEY.

April 7, 1942. KOTT 2,278,933

GONTROL MEGHANISM FOR vPRINTING PRESSES v 7 Filed June 2, 1958 6Sheets-Sheet 6 INVENTOR. HERMAN/V A6777 ATTORNEY.

means of the present invention;

Mama Apr. 1, 1942 CONTROL MECHANISM FOR PRESSES Hermann Kott, East OraN. 1.,

mesne assignments, to SpecdryGr-avm poration Application June z, 1938,serial No. 211,305

12 Claims. (01. 111-311) a This invention relates'to printing pressesand more particularly to high speed multi-color printingpresses. In suchpresses a strip of paper is passedfrom an unwinding roll through asuccession of printing rolls. Each said printing roll apipliesontosuccessive spaced areas of the paper surface a desired pattern, designor printed matter in a different color to produce a desired compositem'ulti-color pattern, design or printed matterjin each said spaced area.It is essential that each color be accurately registered or super-posedone over the other within said spaced areas to form the desiredcomposite printed matter.

-Heretofore in the art, the mechanicaldimculties in the" press mechanisminducing off-registration of color in the said spaced areas have beenreduced to a negligible factor. It has been found necessary, however, toprovide manually operative means whereby the tension on the paper stripmaybe increased or decreased as it passes to color incident to variationin. paper stretching.

one of the objects of the present invention is to provide means wherebythe manual adjustment of said tensioning means is facilitated. Anotherobject is. to provide means to detect and to visually indicate thedegree and the direction of oifiregistration of each color duringtheoperation of the press so that manual adjustment of .the said tensioningmeans is facilitated. Still ings, wherein Fig. l is a schematic drawingillustrating a printing press improved in accordance with the Fig. 2 isaschematlc drawing illustrating the means of the present invention;

Fig. 3 is a diagrammatic drawing illustrating the printing process towhich the present invention is directed as an improvement and the man-'her 01; incorporating the same therewith;

4-;7 inclusive illustrate one feature of the invention in'its variousaspects.

Figs. 8,9, 10. andll illustrate a sectional plan, I a sectio elevation,a horizontal elevation and 'asecond sectional elevation along planes 8 89 9+ 9 (Fig. 8), III-l (Fig. 8) and ll--H (Fig.8) respectively, of asecond feature of the present invention;

each printing roll, to eliminate oil-registration of p Figs. 12, 1s, 14and 15 illustrate in detaila third feature of the present invention:

3 Fig. 16 illustrates diagrammatically a fourth feature of the presentinvention; and

Fig. 17 illustrates diagrammatically a fifth feature of the presentinvention.

The present invention as illustrated in the drawings comprises in itsbroadest concept means to apply to the moving paper a succession ofseries of transversely aligned spots or indexing lines, one for eaccolor being printed, each said spot or indexing lines being appliedsimultaneously with the application of its respective color in adetermined relation to the spaced area upon the paper within which thecolor is to be applied. Obviously the indexing means may, if desired, bean aperture rather than a printed spot. Subsequent to the application ofall ofthe spots or indexing means, means is provided to scan the paperlongitudinally along each path traversed by each said spot or indexingmeans, the said means being located in a plane transversely to thelongitudinal axis of the paper. The scanning means is supplied with acarrier frequency and the modulations of the carrier frequency incidentto, the passage of the spots past the scanning means is converted intoelectrical energy and the modulations inverted to produce a greaterimpulse of electrical energy when the spot is 2 plates of a cathode raytube. Means are provided to periodically move the cathode ray beam alonga straight line path between the horizontal plates of the cathoderaytube in synchronism with the rate of travel .of the moving paper andthe frequency of the said spots transversely located thereon so as tolocate the beam midway between said horizontal plates at the exact timethe said spot, with perfect registration of the spot on the paper, wouldpass the said scanning means. If perfect registration of the spot occursat the time the cathode beam is'centrally located midway between thehorizontal axis, the electrical impulse generated in the scanning meansand inverted as above noted will cause the beam to be verticallydeflected along the vertical center axis of the tube.

If the spot is not so located the vertical displacement will occureither before or-after the said cathode ray beams in a position relativeto the press and relative to the manually operative means provided onthe press for varying the paper tension, th press operator uponobserving the extent of and the direction of vertical displacement ofthe cathode beam from the horizontal path of travel may operate the saidtensioning means forward or reverse to bring any color back intoregistration and the eifect of such operation may be noted within arelatively short time interval depending upon the speed of operation ofthe press.

Referring to the drawings (Fig. 1) I have illustrated schematically themain operating elements of a modern high speed multi-color printingpress which has been improved in accordance with the present invention.The press includes a plurality of printing rolls RI, R2, R3 and R4 eachdriven from a common drive shaft S, actuated by a prime mover M throughsuitable speed regulator means G.

The paper strip p from unwinding roll P passes over a tensioning roll TI(T2, T3 and T4) before passing through each printing roll RI (R2, R3 andR4-respectively). Each tensioning roll TI, (T2, T3 and T4) is providedwith a manually operative means ti (t2, t3 and t4 respectively) movableforwardly or reversely to actuate mechanism moving tensioning roll TI ina direction adapted to increase or decrease the tension on the paperstrip p. As the specific structure of and the specific mode of operationof the press per se or the tensioning means per se forms no part of thepresent invention, further description of the same need not be made forthose skilled in the art.

The improvement of the present invention consists in the provision ofmeans to detect and to visually indicate the degree and direction ofoffregistration of each color, during the operation of the press, sothat adjustment of each of the tensioning rolls TI, T2, T3 and T4 bymanually operative means tl, t2, t3 and t4 respectively may befacilitated.

To facilitate the detection of off-registration of each color, I provideon each printing roll RI (R2, R3 and R4) a spot XI (X2, X3, and X4), ofknown or determined size and configuration.

Each said spot XI (X2, X3 and X4), is located preferably in one of thelongitudinal webs or marginal areas WI (W2, W3 and W4), in a determinedposition relative to a transverse web or marginal area NI. these saidlongitudinal and transverse webs W and N represents the area withinwhich the printing roll RI applies the desired colored inscription asindicated in Fig. 3.

With spots XI, X2, X3 and X4 so located on rolls RI, R2, R3 and R4respectively the paper strip p in passing successively through printingrolls RI, R2, R3 and R4 will acquire in addition to the compositeprinting desired within the spaced areas OI, the several dots XI, X2, X3and X4 in the marginal areas or webs, identified by color (yellow,black, red and blue) in Fig. 4, in exactly the transverse relationshipindicated, provided each color is perfectly registered within the spacedareas OI. Where, 'however, tensioning means T2, for example, isimproperly adjusted spot X2 might be displaced to either dotted positionindicated in Figs. 6 and 7, depending upon whether the paper tension atT2 permitted area OI to arrive at the roll too early or too late forperfect registration of color thereon.

The means to detect off-registration of color as indicated by thelocation of spot XI, X2, X3 and X4 on the paper p, comprisesphoto-sensitive The space OI lying between means FI, F2, F3 and F4 (onefor each color printed) each located in the same plane transverse to thedirection of paper travel in a position to scan the respective webs WI,W2, W3 and -W4 wherein spots XI, X2, X3 and X4 are located as the paperstrip 12 passes from the last printing roll R4 to the usual cutting andfolding means (not shown) associated with the press. Each said means FI,F2, F3 and F4 is identical structurally and the structural features ofthe same are illustrated in Figs. 8 to 11 inclusive.

Referring to these figures, means FI (for example) comprises a source oflight radiation I inclosed within housing 2 provided with an opening 3through which radiation from source I may be projected and lens means 4to concentrate the radiation and to direct the same along light tunnel 6through lens I to prism 8 thence at right angles through opening 9 ofparabolic reflector I0 onto the moving surface of paper 10. The lightstriking the surface of paper p is reflected back through opening 9 andis collected by the reflector I0 and reflected onto photo-cell I I whichis energized thereby to pass an electric current bearing a knownrelation to the intensity of the light radiation falling thereon. As thelight radiation passes through light tunnel 6 it is chopped up intolight impulses by means of perforated disc I2 rotated at a known andconstant speed by motor means I3. The electric current thereby passed byphoto-cell II incident to reflected radiation from paper 3) is similarlychopped up or pulsated.

With this arrangement, the intensity of the pulsating electric currentgeneratedor passed by photo-cell I l remains a constant maximum untilspot XI carried by the moving paper p passes by opening 9. The lightreflecting properties of spot XI being different from that of theuncolored paper changes the intensity of the reflected radi ation whichimmediately affects the intensity of the electric current passingthrough the photocell iI. By the use of suitable filters, the intensitychanges incident to the different colors at each means FI, F2, F3 and F4may be approximately equal.

Referring to Fig. 2, I have schematically indicated the general resultobtained by the detecting means above described. Photo-cell II,energized by battery l4, normally passes a direct current therethroughvarying in intensity with variation in the intensity of light radiationfalling thereon.- When the light radiation is pulsated, as by means I2,the direct current is similarly pulsated and is similar in wave form toalternating current, with its maximum intensity during the time intervalthe uncolored area of the moving paper p reflects the radiation and itsminimum intensity when the colored spot XI interrupts the normalreflection, resulting in a graphic wave form indi cated at Y wherein I5is maximum and I6 minimum intensities.

Before this current from means FI (F2, F3 or F4) can be put to use inaccordance with the present invention this wave form must be inverted sothat the maximum current I 5 is reduced to a minimum current and theminimum current I6 is raised to a maximum current This is accomplishedby the amplifying and inverting means schematically illustrated andidentified as Al in Figs. 1 and 2 and more specifically shown in Fig.17. The amplified and inverted current from each photo-sensitive deviceFl, F2, F3 and F4 is then applied to cathode ray tubes CI, C2, C3 and C4respectively (Fig. l) to produce a separate visual indication of theexact position of mam each spot xi, x2, X3 and x4 relative to thedesired position of perfect registration, as will be more fullyhereinafter described.

Referring to Fig. -1'7, the electrical circuit involved in theamplifying and inverting of the relatively small pulsating directcurrent passing through photo-cell Fl is shown,'with battery l4 (Fig. 2)displaced by direct current obtained from an alternating current source.The pulsating direct'current passing through photo-cell II' is impressedupon one grid of a pentode tube I 20, the amplified plate current of thetube 20 being in turn impressed upon the grid electrode of triode tube2| and further amplified in accordance with well known prior artpractice.

The thus amplified pulsating direct-current is then passed throughprimary winding of alternating current transformer 22. Each end of thesecondary winding of transformer 22 is connected to the grid electrodes23 and 24 of full wave rectifier 25, the plate electrodes of rectifier'25 being tied together and connected to ground potential and to cathode23 -01 triode amplifying the current from means AI has the wave formindicated at Z (Fig. 2) wherein l5' and It indicate minimum and maximumintensities respectively. This inverted current from means AI is thenimpressed across the vertical electrodes 32-32 of a cathode ray tube C,the periodic maximum intensities I6 operating to displace vertically thehorizontally traveling cathode ray beam passing between horizontalelectrodes 34-34 of the cathode ray tube 0.

Cathode ray tube C is one well known in the art, and the schematicillustration of the tube in Figs. 2 and 16 is believed sufiicient forthose skilled in the art. In the normal operation of this type of tube asingle beam of cathode radia- ;tion is projected along the axial centerof the tube between vertical electrodes 32-32 and horizontal electrodes34-34 of the tube and impinges or after the beam, has passedthe'vertical axial center of the tube. I

I accomplish this result by timer means 3 (Figs. 1 and 2), which is moreparticularly illustrated in Figs. 12 to liinclusive which timer means Bpreferably is arranged to energize simultaneously the plurality ofelectrodes 34-34 of the plurality of cathode ray devices C (CI to 4inclusive) indicated in the drawings Figure 1, although separate timermeans for each set of electrodes 34-34 may be employed if desired. Asschematically illustrated in Fig. 2, timer means B is essentially asplit electrical resistance coil 40 one end of which is electricallyconnected to one terminal of source 4| of. electric current. Theopposite terminal of source 4| is electrically connected to oneelectrode 34 of cathode raytube C. The opposite electrode 34 of thecathode ray tube C is connected to a rotatable contact arm 42 andcontact arm is connected for rotation through suitable gearing 43 todrive shaft S actuated by prime mover M.

As indicated (Fig. 2) when contact arm 42 is in the dotted line position42' the full resistance of coil 40 is in the circuit and when the arm 42is in the dotted line position 42" the minimum resistance is in thecircuit. The gearlng 43 is selected relative to the spacing betweensuccessively printed spots XI- (X2, x3 and x4) so that the arm 42 willbe in the solid 'line position shown each time a spot Xi is due to passby the point of observation to intercept the light I beam atphoto-sensitive means Fl. In this position the voltage or potential oneach electrode34-34 is approximately equal and'the cathode beam islocated horizontally mid-way between the electrodes 34-34. Theelectrical impulse induced in photo-sensitive meansFl by means of spotxi upon a ground glass plate forming the top of the potentials betweenelectrodes 32-32 the same cathode beam may be vertically deflectedtowards or away from either electrode 32-32.

In the instant invention, I provide means to cause the cathode beam ineach cathode ray tube to repeatedly traverse a horizontal path from oneelectrode 34 to the other at a periodicity bearing a known relation tothe mechanically fixed rotating speed of the plurality of printing rollsand hence bearing a known relation to the periodicity or frequency ofspot application by the rolls onto the surface of moving strip P andprovide means to bring the position of the beam and the occurrence ofthe maximum intensity voltage it on electrodes 32-32 with consequentvertical displacement of the same" into co-incidence at the axialcenter, when normal or exact registration of color exists. Anydisplacement of 'colorregistration (early or late) will then beevidenced by a vertical displacement or the cathode beam from thehorizontal path, before.

' tical center.

and inverted by means AI will accordingly vertically displace thecathode beam at this point. If th electrical impulse occurs early orlate by reason of the oil-registration of the particular color beingprinted by the roll carryin spot xi, then the vertical displacement ofthe cathode ray beam will fall to one side or the other of the verticalcenterline, andthe horizontal distance away from the axial center thatthe vertical displacement occurs bears a determined relation to theextent of off-registration.

j The pressoperator on observing on which side of the vertical centerline the vertical displacement of the cathode beam occurs on eachcathode ray tube C l C2, C3 and C4 can thereupon adjust manuallyoperative means tl (t2, t3 or t4),

to move tensioningroll Tl (T2, T3 or T4), in the direction adapted tobring the vertical displacement of the cathode ray beam back'to the ver-Referring-to Fig. 16, the circuit arrangement for a single cathode raytube is illustrated, wherein means are provided to draw current from analternating current source A. C. in place of batert 4| (Fig.2); 'Thiscircuit arrangement is duplicated for eachcathode ray'tube Ci, C2, C3and C4.

The alternating current from source A. C. is passed through primarywinding to transformer '53 with lamp 5| and switch means 52 in seriestherewith as is customary in the art. Two secondary windings 54 and 55are'provided on transformer 53. Each of. these windings 54 a and 55 areapproximately of equal number'oi' turns and are adapted to draw currentat ap-' proximately equal voltages, preferably about 210v. as indicated.The current drawn by each winding 54 and 55 is rectified by rectifiers56 and 51 respectively and smoothed out as customcry in the art by theuse of the choke coil and condenser arrangement indicated and is thenpassed across the voltage regulator device indicated. The negative sideof one of these circuits is then electrically connected to one side ofresistance coil 40 of timer B. The opposite side of resistance coil 40is grounded. The negative side of the other or these circuits isconnected through press relay switch 58 to rotatable contact arm 42 oftimer B, and from this circuit also is drawn current through resistance58 and mid-tap connection 60 for application to one horizontal electrode34 of cathode ray tube C. The opposite electrode 34 of the cathode raytube C is connected to ground potential.

Thus connected as contact arm 42 of resistance coil 40 rotates fromdotted position 42' to dotted position 42" the electrical potential willvary on the electrode 34 electrically connected therewith from -210 v.to a zero voltage (at position 42) then to +210 v. an then jump thespace gap between the coil ends to -210 v. and repeat the cycle ofvarying voltages.

The cathode ray beam emanating from cathode 60 at cathode ray tube Cwill accordingly repeatedly traverse the horizontal path indicated indotted lines between electrodes 34-34 in the direction shown by thearrow.

To center the beam horizontally between electrodes 34-34 electrodes32-32 are energized by an electric potential drawn by the circuitenergized by current drawn by secondary 62 known in the art as a beamcentering circuit. On this circuit I superpose the current fromphoto-sensitive tube ii of means F inverted as by means AI as hereabovedescribed utilizing resistance 63 to prevent the current from by-passingback to the circuit supplying the primary beam centering voltage toelectrodes 32-32. The inverted pulsating current from photo cell I ihaving periodic peak voltages representing the periodic interruptions ofthe reflected light radiation falling on the cell H by the passage ofspot X past the housing opening 9, will displace the cathode beamvertically as shown by inverted V, when the said spot X passes opening 9coincidentally with the arrival of contact arm 42 of timer B to thepoint where a zero potential is applied across electrodes 34-34. If thespot X and the position of arm 42 are out of phase the inverted V will bdisplaced to one side or the other of the vertical center line of theelectrodes 32-32 and 36-34. g

The circuit indicated as being supplied by secondary winding 64 is thepower supply circuit for cathode ray tube C and is common to the art.

' The circuit indicated as being supplied by secondary winding 65 is analternating current sweep voltage circuit to operate the cathode beambetween electrodes 34-34 when the press is not running. The current fromthis circuit is supplied through press relay switch 58 to electrodes34-34 when the press stops and relay switch assumes solid line position.As the press starts switch 58 is thrown over automatically to dottedline position again to connect the current from timer B to theelectrodes 34-34 as above described.

Referring to Figs. 12 to 15 inclusive the details of timer means B maybe seen. Instead of the continuous coil 40 schematically illustrated inFig. 2, I prefer to provide a plurality of contacts 66, connecting tothe contacts resistance coils 40 electrically in series to form thesingle coil 40 schematically indicated in Fig. 2. Arm 42 is providedwith a contact 61 adapted to make spring engaged wiping contact withcontacts 66 as it rotatively passes thereover. To facilitate theconnection of contact arm 42 in the electrical circuit indicated in Fig.16, I provid a ring contact 68 for engagement by contact arm 42substantially as indicated which ring contact 68 is electricallyconnected as indicated in Fig. 16 for contact arm 42.- This permitsrelatively free rotation of contact arm 42 by shaft 69 actuated by gears43 driven by main drive shaft S.

From the above description and drawings, it is apparent that manymodifications and adaptations may be made in the present inventionwithout departing from the nature and scope thereof, and all suchmodification and adaptations are contemplated as fall within the scopeof the following claims.

What I claim is:

1. Web register mechanism for multi-cylinder printin presses having aprinting cylinder to apply an impression to a web in register with animpression printed by another cylinder of the press on a predeterminedportion of the web, means for driving the cylinders in synchronism tofeed to the first named cylinder a web having indexing means thereonspaced apart longitudinally of the web to correspond to the desiredspacing of said impressions, electrical means responsive to the registerof the indexing means with respect to the first named cylinder, meanoperated in synchronism with the rotation of the cylinders to actuatethe electrical means to permit the said electrical means to respond toan actuating current supplied thereto during that portion of therevolution of the first named cylinder when the said predeterminedportion of the Web should not register with said cylinder, an electricalcircuit connected to the said electrical means to supply an actuatingcurrent thereto, means to energize the said circuit by an alternatingcurrent to produce a carrier current of a predetermined frequency, and aphotoelectric means in said circuit for detecting said indexing meansand varying the amplitude of said carrier current to supply an actuatingcurrent to the electrical means.

2. Web register mechanism for printing presses having a plurality ofprinting cylinders, means for driving said cylinders in synchronism tofeed a web having longitudinally spaced apart indexing means thereon toa printing cylinder, photoelectric means for detecting said indexingmeans, an electro-responsive device having a first means to maintain anormal electro-responsive operation synchronized with the said drivemeans and having a second means to vary said operation from normal, anelectrical circuit for energizing the second means, means to produce analternating electric current in the said circuit to produce a carriercurrent of a predetermined frequency, and connections to vary theamplitude of said carrier current by the photoelectric means.

3. Web register responsive mechanism comprising a machine having drivemeans for presenting a web having longitudinally spaced apart indexingmeans thereon to a desired location, photoelectric means for detectingsaid indexing means, means for producing a movable instrumentality,means driven in synchronism with said aavaosa drive means to move theinstrumentality in a normal path and in synchronism with the web drivemeans, an electrical circuit having means therein to vary the movementof the instrumentality out this said normal path, means to produce analternating electric current in the said circuit to produce a carriercurrent or a preindexing means thereon to a desired location,

photoelectric means for detecting said indexing means, means forproducing a movable instrumentality, means driven in synchronism withsaid senting a web having indexing ing said indexing means, means forproducing a movable instrumentality, means driven in syn- -chronism withthe said drive means to move the instrumentality in a normal path and insynchronism with the web drive means. a second means to deflect themovable ihstrumentality out of the said normal path, and meanscontrolled second means.

8. Web register mechanism for high speed multi-color printing presseshaving a plurality oi printing cylinders, means for driving s'aid l5cylinders in synchronism to teed a web having drive means to move theinstrumentality in a normal path and in synchronism with the web drivemeans, an electrical circuit'having means therein to vary the movementoi. the instrumentality' out 01' the said normal path, means to direct alight beam intermittently to the detecting means with a predeterminedperiodicity to produce an alternating electric current in the saidcircuit to produce a carrier current of a' predetermined irequency, andconnections tovary the amplitude of the said carrier current by varyingthe light applied to the photoelectric means from the indicia.

5. Web register responsive mechanism comprising a machine having drivemeans for presenting a web having longitudinally spaced apart indexingmeans thereon to a desired location,- photoelectric means tor-detectingsaid indexing 1 means, means for producing a movable instrumentality,means driven in synchronism with said drive means to move theinstrumentality in a normal path and in synchronism with the web drivemeans, an electrical circuit having means therein to vary the movementof the instrumen tality out of the said normal path, a source or lightdirected toward the detecting means, an apertured disc to interrupt thelight from said source, means to rotate the disc at a predeterminedspeed to subject the detecting means to periodically varying lightto-produce an alternating electric current in the said circuit toproduce a carrier current of a predetermined frequency, and connectionsto vary the amplitude of the said carrier current by varying the lightapplied to the photoelectric means from the indicia.

6. Web register responsive mechanism comprising a machine having drivemeans for presenting a web having longitudinally spaced apart indexingmeans thereon'to a desired location, photoelectric means for detectingsaid indexing means, means for producing a movable instrumentality,means drivenin synchronism with said drive means to move theinstrumentalit'y in a normal path and in synchronism with theweb drivein to vary the movement of the instrumentality out of the said normalpath, means to produce an alternating electric current in the saidcircuit to produce a carrier current of a predetermined ..plitudevariations of the carrier current into larg amplitude variations ofcurrent supplied indexing means thereon to a printing cylinder,

photoelectric means for detecting said indexing means, means forproducing a movable instrumentality, means driven in synchronism withstrumentality in a normal path and in synchronism with the rotation oi!the cylinders, a second means to deflect the movable instrumentality outor the said normal path, and, means controlled by the photoelectricmeans for actuating the said second means.

9. Web register responsive mechanism comprising a machine having drivenmeans'for presenting a web having indexing means thereon to a desiredlocation, photoelectric means for detecting said indexing means, acathode ray tube having first electrodes to maintain a normal path orcathode ray beam, second electrodes to defiect the beam out of the saidnormal path, means controlled by the said photoelectric meansto'energize the second electrodes, means driven in synchronism with saiddrive means to enersize the first electrodes with a constantly varyingpotential to cause the beam to move in said normal path in timedrelation to the said drive means.

10. Web register mechanism for high speed multi-color printing presseshaving. a plurality of printing cylinders, means for driving saidcylinders in synchronism to'feed a web having insecond electrodes todeflect the beam out 0! the means, an electrical circuit having meanstheresaid normal path, means controlled by the said photoelectric meansto energize the second electrodes, means driven in synchronism with thesaid drive means to energize the first electrodes with a constantlyvarying potential to cause the i beam to move in said normal path intimed relation to the said drive means.

11. Web register responsive-mechanism comprising a machine having drivemeans for presenting a web having indexing mean thereon to a desiredlocation, photoelectric means for detecting said indexing means, acathode ray tube having first electrodes to maintain a normal path of acathode ray beam, second electrodes to deflect said beam out of the saidnormal path,

means controlled by said photoelectric means to energize said secondelectrodes, means for energizingthe first electrodes, and means drivenin synchronism. with said drive meansto vary the 7 energization of saidfirst electrodes to cause the to the force varying means in theelectrical cir-' cult.

7. Web register responsive mechanism comprising a machine having drivemeans for prebeam to move back and forth therebetween in timed relationto said drive means.

12. Web register responsive mechanism comprising a machine having drivemeans ior pre- 7 senting a web having indexingmeans thereon to meansthereon to a desired location, photoelectric means for detectby thephotoelectric means for actuating the said the said cylinder drive meansto move the inbeam or light to energize said second electrodes anddeflect said cathode ray beam out of its normal path upon passage or anindicium before said photoelectric device, and means driven insynchronism with said web driving means to energize said firstelectrodes with a constantly varying potential to cause said cathode raybeam to move in said normal path in timed relation to said web drivingmeans.

HERMANN KOTT.

